Cutting-tool.



A. BOC'K.

CUTTING TOOL.

APPLICATION FILED FEB. 6. 1917.

Patented Jan. 1, 1918.

. INVENTOR fldam flea/*2 momm- WITNESSE 1 flax 1' theassembl'ed chisels;

.as PATENT OFFICE. A

ADAM, Book, or BROOKLYN, new Yonk.

summer-Toot. 1

To all'whom'z'tmayconcern)- Be it known that-I, AD M Been, a subjectof the German-Emperor, and a resident of thecity ofNew York, (borough of Brooklyn'), in the county of Kings and State- 0f New York, have invented new and Improved Cutting-Tool, of which the following is a full, clear, and exact description.

The invention relates tocutting tools such as are used in pneumatic hammers or held in the hand by a stone mason or sculp- -tor while operating on marble; granite or other stone.

The object of the invention is to provide a new and improved cutting tool arranged to dispense with all blacksmith work for reshaping and resharpening purposesand to allow effective use of'the cutting-tool until worn down to a short stem.

In order to accomplish the desired result, use is made of four assembled "chisels. each approximately square in cross'sec tion and each having a pyramidal end forming-a cutting point, the inner sides of the four chisels adjacent the said pyramidal ends being in contact with each other. The assembled chisels form a cutting tool which is square in cross section, the chisels bemg adapted to be sharpened while in assembled position by abrading the outer'sides of the pyramidal ends to allow use of the assembled chi'sels as a cutting tool for a certain period oftime and the chisels being-adapted to be turned half-way around tobe re-assembled to form a'cutting tool for use in cutting during another period of time.

A practical embodiment of the invention is represented in theaccompanying drawings forming a part of this-specification in which similar characters of reference indicate corresponding parts in allthe views.

Figure 1 is a side elevation of the cutting tool- Fig.2 is an enlarged sectional side elevation of the same; a l

Fig. 3 is an enlarged inverted sectional plan view of the same on the line 38 of Fig. 1';

- Fig; 41s a sectional plan view of thesame on the lineH of Fig. 2;

- -'Fig. 5 is a perspective view of'the' liner for holding the butt ends of the Chisels spaced apart the chisels being shown in dotted lines; v

g- 6 is f Y -of the cuttingendof the c'hisels are worn entire tool useless. ment presently to be described in-- detail,

specifi caticn of Letters Patent. *Patefltgd Ja,n 1, 19i8 Application filed Far 6,- 1'9175 86mm 146377; a

. Fig-z is a side elevation ofrthe assembled the points are-dialled; I a

Fig: 9 is a similar view of'the'same after 'usingsuch a cutting tool fortrimming'blocks down toextreme poetgranite marble and other materials, the

points become dull and require reshaping and resharpening by a blacksmith. During the "reshaping ofi'ithe tool, the latter has to be heated, forgedand tempered and; when this process is" several times repeated, the pointsare liable to" become brittle and break ofl", thus rendering the With the improvethe work of the blacksmith is" entirely dispensed with and the tool can be re-' sharpened by grinding" or abradings and its componentparts can be periodically assembled to allow useot the cutting tool until it is practically used up: As' shownin the drawings fourcl risels 10 of special tool steel are'use'd' yeach made square cross ection a and provided at one end with a' pyramidal point 1 1. Thechisels 1e areassemthe chisel-s fit into a socket 1 9) formed in. a holder 13a- The buttend'sof the chisels: 1O

' projectv into: the tubular portion 145 of the holderr13 and theouter ends project beyond the end of :theholder, aspla-inly indicated in Figsrl and 2". The inner sides of the chisels 1 0 adljacent thepoints 11' are inconerence' to a Fig 5. y

In order to firmly wedge the chisels l0 in bledv te -form a squarein cross section: and

position in the socketx12, the sides of'the latter are-made taperin'gjand a follower 20 I is used and secured intothe tubular portion .174 (if-the holder 13; with theinner end of :the folloWer-20 abutting against the faces of the butt ends of'the. chisels 10, aswill be readily understood by reference to Fig. 2. The follower 2O forms'an integral portion of the stock 21, adapted to be set into the tool holder of a pneumatic hammer, or adapted to be held in the hand of the mason or sculptor making use of the cutting't'ool" at the time. In order to lock the follower 20 in position on the tubular portion 14 of the holder.13,use is made of a sleeve 25 removably fitting onto the outer end of-the follower 20 and, adapted to be secured therechisels, then the. follower 29 is secured into the tubula'r portion l t-of the holder 13 to securely wedge the chisels 10 in the socket 12. The sleeve25-is now placed in position on the outer end of the. follower 20 and then the lug 27 is engaged with one of the recesses 28 and the pin 26' is driven home to fasten the sleeve in position, thus locking the follower 20 from unscrewing relative to the holder 13.

The chisels 10 when first assembled and fastened in the holder 13, as above described, have the inner faces of the cutting ends or points 11 in the form of long bevels, while the outer faces have short bevels, as will be readily understood by reference to Figs. 1, 2, 6 and 7. The chisels 10 while in assembled position and held in the holder 13 aresharpened after the points have become dull by grinding or abrading the outer faces on a suitable rotary grinding or abrading wheel, it being understood that the outer faces of two adjacent points or ends 11 are ground simultaneously. The chisels 10 can be sharpened a number of times in the manner described and while being held in the holder 13, and by reference to Figs. 7, 8, and 9, it will be seen that the repeated abrading of the outer faces of the cutting ends of the chisels make the bevels thereof longer, while the bevels on the inner faces become shorter and the points appear nearer the center of the assembled chisels. When the assembled chisels have been repeatedly sharpened and appear as shown in Fig. 9, then the chisels 10 are removed from the holder 13 and each is given a half turn and then the chisels in this reassembled position are replaced in the holder 13 and wedged in long outer bevels. at the cutting ends, as

during another period of time.

shown in Fig. 9, become the inner bevels and the short inner bevels, shown in Fig. 9, become the outer bevels, that is, the assembled chisels have their cutting ends again in the position as shown in Fig. 7, only the chisels are somewhat shorter. The cutting tool is now again used the same as above described and is sharpened from time to time, and when the chisels again reach the condition shown in Fig. 9, they are removed from the holder and'reversed as above described to permit use of the chisels for another period of time. From thev foregoing, itQwill 1 be seen that, by the arrangement described all -blacksmithing work is completely dispensed with and when the points become dull, it is only necessary to grind the outer faces thereof. When the chisels, after repeated sharpening, reach the condition shown in Fig. 9, they are reversed as described and re-used It will be seen that the chisels can be used until the cutting points are close to the holder. 13.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. A cutting tool comprising a tool holder having a square-socket,a plurality of as sembled chisels fitting the said socket, a 1

. cross shaped spacer having its members extending between the butt ends of the chisels to hold the butt ends spaced apart, and a stock screwing into the said holder and against the end faces of the buttsof the chisel. Q

2. A cutting tool comprising a toolholder having a square socket, a plurality of'assembled chisels fitting the" said socket, a

cross shaped spacer having its members eX- tending between thebutt ends of the'chisels to hold the butt ends spaced apart, a stock screwing into the said holder and against the end faces of the butts of the chisel, and a lockingdevice locking the said stock in place on the tool holder.

3. A cutting tool, comprising a holder having a square tapering socket, four reversible chisels approximately square in cross section and each having at its outer end a pyramidalpoint, said chisels having their butt ends extending into the holder and their cutting ends projecting from the holder and in contact with'each other, means for spacing the butt ends of the chisels, and adjustable means for engaging the butt ends of the chisels.

4. A cutting tool comprising a tool holder having a square socket provided with tapering sides, a plurality of assembled chisels square in cross section and fitting the said socket, the butt ends of the chisels projecting into the holder and the pointed ends. of the chisels projecting beyond the said holder, a cross shaped spacer fitting between the butt ends of the chisels, a stock pyramidal ends being in contact with each I other, the assembled chisels forming a cutting tool square in cross section, the chisels being adapted to be sharpened in assembled position by abrading the outer sides of the pyramidal ends to allow use of the assembled chisels as a cutting tool for a period of time and the chisels being adapted to be turned half Way around and to be assembled to form a cutting tool for use in cutting and resharpening during another pcriod of time.

v ADAM BOOK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. G. 

